标题: | Effect of ZrO2 Crystal Structures on the Catalytic Performance of MnOx-CeO2/ZrO2 for Selective Reduction of NO with NH3 at Low Temperature |
作者: | Xu, Yifan Liu, Rong Jia, Feng Ji, Lingchen Ye, Fei 環境工程研究所 Institute of Environmental Engineering |
关键字: | Selective Catalytic Reduction;Zirconia Polymorphs;Low Temperature;SO2 Poisoning |
公开日期: | 1-十二月-2017 |
摘要: | A series of manganese oxide and cerium oxide catalysts supported on monoclinic zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2) and cubic zirconia (c-ZrO2) were prepared by a wet-impregnation method. The catalytic performance and SO2 tolerance for the selective reduction (SCR) of NOx with NH3 were investigated. Measurements were carried out in a fixed-bed reactor. The results suggested that both SCR activity (NO conversion on the catalysts) and SO2 tolerance of the prepared catalysts decreased in the following order: 5 wt.% MnOx-CeO2/c-ZrO2(5c) > 5 wt.% MnOx-CeO2/t-ZrO2(5t) > 5 wt.% MnOx-CeO2/m-ZrO2(5m) Surface properties are discussed by using XRD, BET, SEM, XPS, TPR, TPD and TG-DTA, FT-IR. 5 wt.% MnOx-CeO2/c-ZrO2 catalyst exhibited the best redox property and the highest adsorption capacity for NH3 while 5 wt.% MnOx-CeO2/m-ZrO2 and 5 wt.% MnOx-CeO2/t-ZrO2 catalysts exhibited relatively poor performance. Also, there existed the largest density of acid sites and highest strength of acidity when c-ZrO2 was used as carrier. The deterioration of active component and deposition of NH4HSO4, (NH4)(2)SO4 or metallic sulfites were identified as the main causes of SO2 poisoning. |
URI: | http://dx.doi.org/10.1166/sam.2017.3124 http://hdl.handle.net/11536/144354 |
ISSN: | 1947-2935 |
DOI: | 10.1166/sam.2017.3124 |
期刊: | SCIENCE OF ADVANCED MATERIALS |
Volume: | 9 |
起始页: | 2104 |
结束页: | 2113 |
显示于类别: | Articles |